Hi Thom,
Just a minor point about the Wallytractor. You said "The defunct Cartalign (like Wally's) is mirrored, and works similarly to Wally's, in that you need to rotate it so that an index line points from the record spindle to the bearing pivot's center."
There is a line on the Wally tractor that points from the spindle to the pivot point. But you do not need to align this line with anything. According to the Wallytractor directions you need to verify that the pivot to spindle distance is within + or - .5mm of the pivot to spindle distance inscribed on the Wallytractor. Once the distance is verified, you place the Wallytractor over the spindle hole and rotate the Wallytractor so that "Point 0" (the outer edge of the arc, is directly under the stylus. Then you move the tonearm in to "Point 1" which is just outside of the label area. If the stylus is outside the arc at "Point 1" then the cartridge needs to be moved back towards the pivot point or away from the pivot point if the stylus is inside the arc. Change the overhang and go back to "Point 0" and start all over. Eventually, the stylus will follow either the Baerwald or Lofgren arc all the way from "Point 0" to "Point 1". No visual sighting of the spindle to pivot line is needed. Getting that sight line accurately has always been a problem for me when I used other protractors. That is why I like the Wallytractor - no sight alignment required.
As you know, I change cartridges quite frequently. I find the Wallytractor to be, for me, easy to use and more accurate than any of the other protractors that I have tried. Wallytractors are expensive, but to me are worth the extra cost. YMMV.
Just a minor point about the Wallytractor. You said "The defunct Cartalign (like Wally's) is mirrored, and works similarly to Wally's, in that you need to rotate it so that an index line points from the record spindle to the bearing pivot's center."
There is a line on the Wally tractor that points from the spindle to the pivot point. But you do not need to align this line with anything. According to the Wallytractor directions you need to verify that the pivot to spindle distance is within + or - .5mm of the pivot to spindle distance inscribed on the Wallytractor. Once the distance is verified, you place the Wallytractor over the spindle hole and rotate the Wallytractor so that "Point 0" (the outer edge of the arc, is directly under the stylus. Then you move the tonearm in to "Point 1" which is just outside of the label area. If the stylus is outside the arc at "Point 1" then the cartridge needs to be moved back towards the pivot point or away from the pivot point if the stylus is inside the arc. Change the overhang and go back to "Point 0" and start all over. Eventually, the stylus will follow either the Baerwald or Lofgren arc all the way from "Point 0" to "Point 1". No visual sighting of the spindle to pivot line is needed. Getting that sight line accurately has always been a problem for me when I used other protractors. That is why I like the Wallytractor - no sight alignment required.
As you know, I change cartridges quite frequently. I find the Wallytractor to be, for me, easy to use and more accurate than any of the other protractors that I have tried. Wallytractors are expensive, but to me are worth the extra cost. YMMV.